利用直接求微分的方法，给出了右伸长张量率的不变性表示公式。
An invariant formula for the right stretch tensor rate is given by a differential method directly.
给出了函子范畴中任意右正合保直和可加函子F与张量函子B自然等价的一个定理。
A theorem on natural equivalences between a right exact additive functor F which preserves sums and some tensor functor ?B over functor categories is given.
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